Runtime config for less trustworthy validators

[Kouteki]

Description

Currently we allow trusted validators to run nodes, and they are in the position where they can take down a network by changing the blockchain configuration of their node (ex. by changing the gas limit).

We want to create a runtime configuration that limits the node operators to parameters that don't threaten the network.

Continuation of #1856

[moul]

We need to transition from configuration files or CLI arguments to r/sys/params for all parameters that should remain consistent across every node. This will ensure that everything contributing to the runtime is deterministic.